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PATENTED JAN. 5, 1904.

No 748,772;v

l E. MHLNGHAUS- LUCK.

APPLIUATIUN HLBD JULY ze, 1903.

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Witnesses:

fNo. 748,772. PATENTED JAN..5,'19Gl.1.v

" 4 E. MHLINGHAUS.

LOCK.

' APPLICATION FILED JULY 28. 1903. Y N D MODEL. ZSHEBTS-SHEBT 2.

Witnesses:

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UNITED STATES atented d'anuary z5, IlI.

PATENT OFFICE.

ERNST MHLINGHAUS, OF METTMNN, GERMANY, ASSIGNOR TO. THE FIRM OF BERNSAU da UELLENBERG, VOF VARRESBECK, NEAR ELBERFELD,

PRUSSIA, GERMANY.

LOCK.

SPECIFICATION forming part of Letters Patent No. 748,772, dated January 5, 1904.

Application filed July 28,1903. Serial-No. 167.231. (No model.)

To all whom .it may concern:

Beit known that I, ERNST MHLINGHAUS, a citizen of the German Empire, residing at Mettmann, in the Province of Rhenish Prussia, Kingdom of Prussia, Germany, have in vented certain new and useful Improvements in DoorLocks, of which the following is a specification.

This invention relates to an improved lock 1o for doors; and its pecnliarity consists in this, that the locking-bolt is so constructed that it at the same time can serve as the latch. The locking-bolt therefore projects beyond the case aise in the opened position and by that I5 projecting part, which is of round or square section and set diagonally, it reaches into a recess cut in a part of the strike-plate on the corresponding door-post, said recess allowing the entrance and withdrawal of the door with the bolt in its ordinary position; but when the bolt is driven forward in its position for locking the door it reaches behind the remaining part of the strike-plate where the recess is cut therein, and then the door is locked and cannot be opened. Inside of the strike-plate is arranged a double spring catch or detent which holds the holt and the door fast, but

allows the opening of the same by a pull or a push on the door when the bolt is not driven forward in its locking position. A safetylatch can be conveniently combined with the bolt, allowing the locking of the bolt, so that it cannot be opened from the outside with a key. I attain these objects by constructing the lock as illustrated ou the accompanying drawings, in which- Figure 1 is a view in plan with the bolt in its ordinary position for opening the door. Fig. 2 is a similar View with the bolt in its closed position and showing also the safetylatch locked. In both igures the coveringplate is taken off. Fig. 3 is a section along line I I of Fig. l, the door being closed. Fig. 4 is a similar section, the bolt being midway between the spring-catch. Fig. 5 shows a modification in construction with a roundended bolt and pyramidal-shaped detents.

Fig. 6 is a cross-section along line IIII of Fig. l, and Fig. 7 is a similar section along 5o line III III of Fig. l.

The bolt l lies on the bottom plate 2 ofthe case and is guided bythe pin la. By a key 3 it can be driven forward and backward, and by the tumbler i it can be retained in'its opened or closed position. The head 5 of the 55 holt is of square section in Figs. l to 4 and 6 and 7, and it is so arranged that its diagonale stand vertical and parallel, respectively, to the case-plate 2. It is guided in the ledge or front edge 6 of the case, and it is of such length that in its turned-back or open position, Fig. 1, it still projects a certain distance ont of the ledge.

The strike-plate 7 8, fixed to the door-post, is of angular shape. An opening 9 10 is cut therein just opposite the bolt-head, so that the latter can pass throughthe opening 9 of one side of the staple-plate and enter into the opening 10 ofthe other side 8 of the same .when it is in its ordinary drawn-back posi- 7o tion, but that when it is pushed forward in its locked position its fore end will reach behind the edge of the opening 9 in the strikeplate and then hinder the opening of the door.

Behind the strike-plate in a cutout part of 75 they door-post there are arranged in it pins 1 13, which are guided at their thin ends by brackets 11 and at their central thick end by closed guides 12, so that they canbe moved up and down, but that they are hindered from turning. Their enlarged forked central ends or heads 13a, facing each other, are pro- ,vided with rolls 15, which are pressed toward each other by springs 16, surrounding the pins 13. The rolls 15 of these pins stand ex- 85 aetly in the middle of the opening 9 opposite the bolt-head 5, so that when this is pressed against them it will press them asunder by its slanting sides, which act like a double wedge against the rolls 15so that the yone is pressed upward and this other one downward, and as soon as the bolt-head has passed the rolls l5 in one direction or the other they close upon it and hold the door closed in one position or allow its free opening in the other one. To open the door or to close it, it requires thus to overcome the pressure of the springs 16 by pushing the bolt-head against the rolls 15 or by pulling it out between them.

The same effect may be attained by constructing the bolt-head and the respective ends of the pins 13 as shown by Fig. 5-that is to say, by giving the bolt-head 5' a cylindrical form and shaping the respective ends 15a of the pins so as to form short cones or pyramids, as shown by Fig. 5 of the drawings. This of course gives the same effect.

Just over the free end of the tumbler 4 is arranged a safety-latch 17, which is fixed to the pin 17b of a handle or knob 18 and which by its rectangular corner 17a, and the spring 20 is either held in a horizontal position, Fig. 1, or in a vertical position, Fig. 2. In the first case it allows the raising of the tumbler 4 against the pressure of the spring 4a by the key 3, and thus the pushing forward or backward of the bolt 1. In the other case the tumbler 4 is locked by the latch 17, and the bolt 1 cannot be shifted either by a key from the inside or from the outside of the door as long as the latch 17 has not been turned in its horizontal position, Fig. 1, by the knob or handle 18. The handle 19 (shown in Fig. 6)

is merely a sham handle to cover the hole in the door, by which the nut 20 of the handlepin is fastened. From Fig. 2 it will be seen that when the bolt 1 is pushed forward its fore end will reach behind the edge of the recess 9 in the plate, and then `the lock is closed, and the tumbler 4 holds it locked by engaging its tooth 21 with the notch 22 in the bolt, and if then the safety-latch 17 is turned downward, standing with its end in the recess 23 of the tumbler, the lock cannot be opened by a key unless the latch is turned upward again.

Having now described my invention, I declare that what I claim is- 1. In a d'oor-lock-a bolt 1 a guide-pin 1a on the bottom plate 2 of the lock-case, said bolt having a head 5 connected to it, a tumbler 4 having a tooth 21 pressed into respective notches 22 by a spring 4a in combination with a strike-plate 7, 8 having recesses 9, 10 respectively cut inits sides and allowing the bolt-head 5 to enter therein, pins 13 connected to said strike-plate and guided therein by brackets 11 and 12 respectively, rolls 15 fixed to the forked inner ends'13a of said pins 13, springs 16 pressing the rolls 15 toward each other, the Whole as described and illustrated and for the purpose set forth.

2. In a door-lock a bolt 1 a guide-pin 1a on the bottom plate 2 of the lock-case, said bolt having a head 5, connected to it, a tumbler4 holding the bolt in eitherv of its entrance positions, a strike-plate 7, 8, provided with recesses 9, 10 in the sides of said strike-plate, brackets 11, 12 guiding-pins 13 therein,forked inner ends on said pins, rollers 15 held in said forked ends, springs 16 pressing said bolt-heads together for arresting the bolthead 5 in combination with a latch 17 on the spindle 17a of a handle 18, said latch engaging with'a recess 23 of the tumbler for locking the same, the whole as described and illustrated and for the purpose set forth.

In testimony whereof I have alixed my signature in presence of two witnesses ERNST MUHLINGHAUS.

Witnesses:

OTTO KNIG, J. A. RITTERSHAUS. 

